archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-09-22 20:14:43 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

8238665: Add JFR event for direct memory statistics

Browse source 
Reviewed-by: egahlin, alanb
This commit is contained in:
Denghui Dong 2020-04-14 20:36:33 +02:00
parent 1cc71b41de
commit a62a0e5282
13 changed files with 276 additions and 27 deletions
Download patch file Download diff file Expand all files Collapse all files

24
src/java.management/share/classes/sun/management/ManagementFactoryHelper.java
View file

@ -39,8 +39,9 @@ import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import jdk.internal.access.JavaNioAccess;
import jdk.internal.access.SharedSecrets;
import jdk.internal.misc.VM;
import jdk.internal.misc.VM.BufferPool;
import java.util.ArrayList;
import java.util.List;
@ -52,6 +53,7 @@ import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collectors;
/**
* ManagementFactoryHelper provides static factory methods to create
@ -337,16 +339,16 @@ public class ManagementFactoryHelper {
static final PlatformLoggingMXBean MBEAN = getInstance();
}
private static List<BufferPoolMXBean> bufferPools = null;
public static synchronized List<BufferPoolMXBean> getBufferPoolMXBeans() {
private static volatile List<BufferPoolMXBean> bufferPools;
public static List<BufferPoolMXBean> getBufferPoolMXBeans() {
if (bufferPools == null) {
bufferPools = new ArrayList<>(2);
bufferPools.add(createBufferPoolMXBean(SharedSecrets.getJavaNioAccess()
.getDirectBufferPool()));
bufferPools.add(createBufferPoolMXBean(sun.nio.ch.FileChannelImpl
.getMappedBufferPool()));
bufferPools.add(createBufferPoolMXBean(sun.nio.ch.FileChannelImpl
.getSyncMappedBufferPool()));
synchronized (ManagementFactoryHelper.class) {
if (bufferPools == null) {
bufferPools = VM.getBufferPools().stream()
.map(ManagementFactoryHelper::createBufferPoolMXBean)
.collect(Collectors.toList());
}
}
}
return bufferPools;
}
@ -357,7 +359,7 @@ public class ManagementFactoryHelper {
* Creates management interface for the given buffer pool.
*/
private static BufferPoolMXBean
createBufferPoolMXBean(final JavaNioAccess.BufferPool pool)
createBufferPoolMXBean(final BufferPool pool)
{
return new BufferPoolMXBean() {
private volatile ObjectName objname; // created lazily